Does this work on subdomains?

I am unable to authorize. I get:
400. That’s an error.
Error: redirect_uri_mismatch
Application: GMail SMTP
The redirect URI in the request, https://dev2.xxxxxxx.com/wp-admin/options-general.php?page=gmail-smtp-settings&action=oauth_grant, does not match the ones authorized for the OAuth client. Visit https://console.developers.google.com/apis/credentials/oauthclient/586633491042-bk3a9n0piicjd8ve5pavv30sd3kh7586.apps.googleusercontent.com?project=586633491042 to update the authorized redirect URIs.

The url added to Authorized redirects is clearly the correct url. I have reset it and set it up again with the same result. All I can figure is that its due to a subdomain. Any ideas?